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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40f6972819406936336bb62cf938e6896e046502bb3b3477a8c35b84cf1fe306' 
  AND token = '0lAdie47yHdZqZBxHlt7uhFRM8Bu56j8RX6MmOkw5+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}